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What This Guide Helps With
Frequent over-temperature alarms or automatic heater shutdowns, often caused by airflow restriction, setup issues, or accessory problems rather than internal failure.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the device from active patient use and transition to an alternate warming method.
- Expected: No patient connected during troubleshooting.
Verify Alarm Condition
- Confirm the unit is displaying an over-temperature alarm or shutting down heating automatically.
- Expected: Heater disabled with alarm indication.
Power Cycle the Unit
- Turn the unit off, wait 10–15 seconds, then power back on.
- Why it matters: Clears temporary control or sensor faults.
- If alarm clears and does not return → issue resolved.
Check Set Temperature
- Verify the setpoint is within normal clinical range (typically ~37–41°C).
- Why it matters: Excessively high settings can trigger safety shutoff.
- If corrected and stable → issue resolved.
Inspect Blanket / Pad Connection
- Ensure the hose and warming pad/blanket are securely connected and not kinked.
- Expected: Firm connection, no airflow restriction.
- If restricted → correct and retest.
Verify Proper Blanket / Pad Type
- Confirm the correct Stryker-compatible blanket or pad is in use.
- Why it matters: Incorrect or incompatible accessories can cause improper heat transfer and overheating.
- If incorrect → replace with correct accessory.
Check for Airflow Obstruction
- Inspect air intake and exhaust vents for blockage (linen, dust, positioning against wall).
- Why it matters: Restricted airflow causes internal overheating and safety shutdown.
- Clear any obstructions and retest.
Evaluate Blanket Placement and Patient Load
- Ensure the blanket is not folded, compressed, or tightly tucked restricting airflow.
- Expected: Even airflow distribution across the blanket.
- If adjusted and alarm stops → issue resolved.
Inspect for Moisture or Fluid Exposure
- Check for any fluid ingress around the hose connection or unit housing.
- Why it matters: Moisture can affect temperature sensing and safety circuits.
- If present → remove from service.
Test with Alternate Blanket / Hose
- Swap with a known-good accessory set.
- Why it matters: Rules out accessory-related restriction or defect.
- If issue resolves → faulty accessory identified.
If the Problem Persists
After ruling out airflow, accessories, and setup issues, the problem is likely internal (temperature sensor, control board, or heater regulation fault).
Remove the device from service, label it Out of Service, and send for repair or bench evaluation.
Knowing when to stop prevents unsafe operation and unnecessary risk.
Clinical Use Tip
Never troubleshoot a warming device while connected to a patient. Always transition the patient to a safe alternative before evaluation.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Unit alarming with over-temperature shutdown during use in OR."
Cause
What was observed during troubleshooting.
Example:
"Airflow obstruction from blocked intake vent due to linen placement."
Resolution
What action was taken.
Example:
"Cleared obstruction, verified normal airflow and operation, returned unit to service."
Helpful Details to Include (If Known)
- Outlet tested and verified
- Alarm message behavior
- Vent obstruction found or not
- Accessories swapped
- Any fluid exposure
- Final operational status
Final Thought
Over-temperature shutdowns are often caused by airflow restriction or accessory issues, not immediate internal failure. A structured, external-first approach ensures patient safety while avoiding unnecessary repairs. Proper escalation and clear documentation complete the process.
That is successful troubleshooting.